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Johnson 150 not charging no tach

I have replaced my rectifier part 585219 and it worked for two seasons maybe. Now I am getting the same no charge and no tach. Some days it will work great. Others it will be in and out all day.

I have tested the stator and get the following reading.

1.4 Ohms on the two yellow wires
20 v ac when running.
No tach when gray wire is attached to either yellow wires.

95 Johnson 60 degree 150. Thanks
 
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